On my half stock Hawken elk rifles, the front sling attachment requires a grrove filed into the bbl side of the rib. The sling holder is made from a coat hanger and the inside of narrow end {a little wider than the rib} fits into the groove. The hi temp silver solder joint is at the narrow part that fits into the groove. When the front sling holder is close to the bbl, it lands on the RR pipe so it doesn't obstruct the RR. This arrangement requires a removeable rib.
The rear sling holder is also made from a coathanger and a pin w/ a horizontal hole is riveted to the `1/8 " thick toeplate which is screwed down w/ 3 fairly long screws.
Hawken rifles are fairly heavy and this sling attachnent has withstood many hrs of lugging these heavy rifles uo and down the Rockies. ......Fred